step in debugger?

[Charles Hartman]

I've been bumbling numbly along with debugging -- and somehow it just  
occurred to me that something's wrong here:

I put a breakpoint on a line in the middle of a script, run till I  
hit it, look at some variables, press Step . . . and the script runs,  
not stopping till complete/crash/next breakpoint.

In any other debugging environment I've seen, that's not what "step"  
means. It means execute the currently-highlighted line and stop.

(This is using Constellation, but I assume it's behavior of the  
underlying debugging engine, not the UI.)

Charles Hartman